History: A German aviator's suit is equipped with electrically heated face mask, vest, and fur boots. Open cockpit flight meant pilots had to endure sub-freezing conditions. 1917, [1.500X1.283]

https://i.redd.it/uugg5m8i9mwz.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/7bg5vc/a_german_aviators_suit_is_equipped_with/?utm_source=ifttt